Hydraulic cement and process of making the same.



i nous materials to a selected quantity of taillurrnn so Pair-lunar m rten.

CABLE DAVVES CLARK, OF CLllFTOh- ARIZONA. TERRITORY.

HYIDHAULIIU @Ellllfihl'll' AND PHOGEtlf-Si OF lllll-tlrtlhlGi Til-it"; htfllwlEi Specification of Letters Patent.

Patented Feb. 6, 190a.

Application filed December 24, 1904;. Serial No, 238,201.

To all/Z whom it may concern: I

Be it known that I, CABLE DAWES CLARK, a citizen of the United States, residing at (flli'l ton, in the county of Graham and Territory of Arizona, have invented new and useful 1m provements in Hydraulic Cement and Processes of Making the Same, oi which the following is aspecification.

This invention relates to the manufacture of hydraulic cement; and its object is to compound a cement having similar qualities to the Well-known Portland cement, utilizing for thispurpose ccrtainwaste 111aterialto wit, the tailings from concentrating orother mills treating copper and other ores mined with an aluminous and silicious gangue.

' Good Portland cement is composed of from 18.5 to twehtydive per cent. of silica, (Si(),,,) from. 60.8 to 69.2 of the oxids of calcium, magnesium, sodium, and potassium (Cat), MgO, Na O, K 0), minus calcium sulfate, which is inert, and from six to lifteen per cent. of the oxide of aluminium, iron, copper, and manganese, (A1 0,, Fe fi Cut), M110.)

The analysis of selected tailings secured by simple hydraulic classification shows that they contain from fifty-six to seventy-eight per cent. of silica, l'rmntwo to eight per cent. of the lime group, and from sixteen to thirtysix per cent. of the aluminous group, the terric oxid and alumina predomiiiating. It is therefore only necessary to add the proper percentage of limestone or lime and ferrugi lugs to produce an excellent Portland cement. Moreover, since the lailings can be varied in composition in the process of selecting them by washing it is clear that a cement of any'dcsired chemical composition and rapidity of settingcan be obtained.

In carrying out the process one part of the selected tailings, dried, it necessary, is mixed with from 2.5 to 4.7 parts of a calcareous substance, such as limestone, the percentages varying with the analysis of the two constituents and of the desired cement. The mass is crushed, ground, pulverized, and comminuted to a uniform mixture and of a fineness such that fifty per cent. or more will pass through-a two-llumlrcxlmicsh. screen. it is then burned in a suitable kiln, using coal, c1 )l($ ,()ll, or gaseous incl, at a hi gh tem perature uni il a chemical combination takes place between the CaO and Fe,,0 and All), and Si'OJ forming a clinker. This clinker is ground and pulverized to a suitable fineness and is then ready for use as a hydraulic cement, be ingsuitable for all the uses for which. Portland cemcntis capable. However, owing; to the purity of the silicious and alui'ninous constituents used in its manufacture this ccnieint is of greater strength and whiter color than the cements now on the market with which I am familiar. This purity is due to the fact that all. heavy minerals and impurities have been previously removed from the tailings in the process of concentration or other mill treatment. Inasmuch as the percentage com osition ol the tailings can be varied from liighly silicious to highly aluminous by Sim-- ple washing, a superior cement of constant composition can always be secured.

Having thus described my invention, what I claim. is-

'1. The process of making hydraulic ce-.

ment, which consists in hydrau lly classic tying the tailings from concentrating or other mills treating ores with an alu mino us silicious gang'uc, mixing them with a calcareous substance, reducing the mass to powder, burning the mixture to a clinker, and pulverizing said clinker.

2. The process of making hydraulic ce- 'ment which consists in pulverizing tailings hand and seal.

time cures other. [1,. s]

Nitnesscs:

DAVID L. H. Forums, .ltALPn hlELLA. 

